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Thruthefence
04-03-2012, 09:40 AM
One of my hangar neighbors was cleaning out an old desk, used by a now 10 years deceased old school aircraft mechanic, and among the Pratt & Whitney radial engine tools and other debris was a couple of these things:

http://i1204.photobucket.com/albums/bb405/thruthefence/mysterytool3.jpg

http://i1204.photobucket.com/albums/bb405/thruthefence/mysterytool2.jpg

http://i1204.photobucket.com/albums/bb405/thruthefence/mysterytool1.jpg

I'm thinking some sort of crimping tool?

I'm using one of them as a 'stop' for my spindle holding tool.

http://i1204.photobucket.com/albums/bb405/thruthefence/spindlelock.jpg

The magnet holds the tool in place, the "tool" limits rotation of the spindle on My Emco-Meier Mill while changing tooling.

oddball racing
04-03-2012, 09:42 AM
Those clamp onto a framing square. For repeated cuts when making stair treads is one use.

Toolguy
04-03-2012, 09:53 AM
Yup - one on each leg of the square. Good for building roofs too. It's an easy way to do repeatable angle marking.

Thruthefence
04-03-2012, 10:10 AM
Well, I guess old Harry was a carpenter, as well as an ass-kick aircraft mechanic! Thank's guys!

flylo
04-03-2012, 10:32 AM
We always called them stair knockers.

BMW Rider
04-03-2012, 05:11 PM
Here's a set you can buy with a diagram of how to use them.

http://www.leevalley.com/en/images/item/woodworking/markmeasure/05n5301s1.jpg (http://www.leevalley.com/en/wood/page.aspx?p=41714&cat=1,42936,42944&ap=1)

http://www.leevalley.com/en/images/item/woodworking/markmeasure/25n0801d1b.gif

sasquatch
04-03-2012, 05:46 PM
Agreed stair gauges, and about the nicest ones i've ever seen.